- Just be yourself if you're not yourself you tend to shiver and be shy
- Put questions on a paper to ask them questions
- Managers in general likes the person to answer questions so it sounds like you're interested in the job
- Be confident
- Stress smart for the job
- Personal Hygiene is the main factor
- Time Keeping, don't be late for your interview
- Know what you're saying other it's going to be a awkward time for you
(Some others I forgot.)

Kunta wrote So your first job is to help other people find first jobs? the irony. Great work but

Helping your nerves? Drugs.
But on a real note, there's a whole lot of things that can help you out. Do some practice interviews with friends/family. They're are also places that help out with some stuff like this (Job finding businesses).

Just be confident, and in your interview even tell them that this is your first interview and you're nervous. Usually your interviewer is really nice and it'll end up just being a conversation in the end.

Goodluck mate.

No, the people are interviewing me for the job of working, not to help find people, which is why i am nervous

the best way to not be nervous, is to not be nervous